Versalift 24, Руководство пользователя

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59”
24”
O.C.
31”
Fig. 15
PLACE BLOCK
INTO INSET
THEN MARK
OFFSET LINE
OFFSET LINE
OFFSET INSET
I-JOIST
HEADERS
I-JOIST
SECTION
2 x 4" or 2 x 6"
BLOCKING
I-JOIST/HEADER
BLOCK
WOOD
GLUE
USE 2" NAILS
or SCREWS
BLOCK
Fig. 14
58 3/4"
JOIST
2 EACH
29 3/4"
2 EACH
JOIST
58.5"
24”
O.C.
30.5"
CUT 1/4" PLYWOOD TO
PANEL INSIDE OF I-JOISTS
Fig. 16
Optional Framing Technique #3
FOR NEW HOME CONSTRUCTION USING
I-JOISTS ON 24” CENTERS:
(This technique requires that you have additional I-Joist
of the same size as that used in your ceiling. If you do not
have additional I-Joist, see the technique on page 10.)
I-Joists differ from solid lumber in that the “I” shape beam
is too narrow for “end nailing” when attaching one I-Joist
perpendicular to the face of another. Furthermore, the
face of an I-Joist is inset, making it less than an ideal
surface to join something to.
One way to address both problems is to install blocking
on the ends of I-Joist sections and headers (Fig. 14):
First, the block provides a thickness to the end of the I-
Joist that can be nailed into. Second, the block is offset
so that it fits into the inset in the face of the perpendicular
I-Joist. The blocking should be attached securely (Fig.
14 inset) and placed on the side opposite the opening
(the opening must not have anything projecting inward).
Another problem with I-Joists is that the recessed face
forms ledges that can hang-up on the lifting platform as it
travels downward from the attic. To resolve this problem,
the opening must be framed ½”oversized in each
dimension to 59” x 31” (Fig. 15) so that 1/4” thick
plywood can be cut (Fig. 16 inset) and used to panel all
four I-Joist faces inside the opening to produce the final
size opening of 58 ½” x 30 ½” (Fig. 16). Please note that
any nail heads in the opening must be set flush or below
the surface and decking and sheet rock must not extend
into the opening (Fig. 2a & 2c on page 5).
NOTE: These illustrations show I-Joist on 24” centers, but
this framing procedure can also be used for 16” centers
(page 8). As with solid wood joists, I-Joists that need to
be cut must be supported by some means until they are
connected to headers that tie them to adjacent I-Joists.
Note: I-Joist hangers can be used instead of blocking.
Finish opening with 1/4” paneling to cover hangers
and create a smooth-sided opening (Fig. 16), then
install 2 x 2” flashing in every corner (Fig. 2b, pg. 5).
9
Versa Lift
Installation - Framing Techniques Optional
INSIDE FINISHED OPENING
INSTALL 2 x 2” FLASHING
I-Joist
Hanger
Depending on location
and code requirements,
web stiffeners may be
required for I-Joist when
using hanger brackets.
Web Stiffener